Tuyere or like blast-furnace appliance



United States Patent Inventors Appl. No.

Filed Patented Assignee TUYERE 0R LIKE BLAST-FURNACE APPLIANCE 2 Claims, 4 Drawing Figs.

US. Cl l22/6.6,

266/41 Int. Cl. F22b 37/00 Field of Search 122/66;

Primary Examiner-Kenneth W. Sprague Att0rneyMartin J. Carroll ABSTRACT: A tuyere or like appliance for a blast-furnace comprises inner and outer co-axial frusto-conical shells. Spaced parallel walls extending longitudinally therebetween form an entrance passage for cooling water. A plurality of plane segmental baffles or rings spaced axially of the tuyere and abutting alternately against said passage walls, respectively, form a continuous circulating passage back and forth around the tuyere. This passage communicates at one end with the entrance passage. An inlet and an outlet for cooling water are connected to the ends of the entrance passage and the circulating passage, respectively, at the larger end of the tuyere.

|| 0 II II II II n TUYERE OR LIKE BLAST-FURNACE APPLIANCE This invention relates to a tuyere or like appliance for a blast furnace, such as a slag-notch cooler.

Blast-furnace tuyeres and slag-notch coolers have been constructed heretofore for the circulation of cooling water therethrough but the circulation achieved has not been effective to give adequate cooling because of low water velocities, dead spots, etc., resulting in unsatisfactory heat abstraction, hot spots and early deterioration or burn-out. We have invented a tuyere which fully overcomes these deficiencies. Our invention may also be embodied in a slag-notch cooler.

SUMMARY OF THE INVENTION In a preferred embodiment, our invention, whether applied to a tuyere or a slag-notch cooler, comprises co-axial inner and outer frusto-conical shells telescoped with their ends substantially coterminous. Spaced parallel walls extend longitudinally between the shells and form an entrance passage from one end of the tuyere to the other, although one wall terminates short of one end of the tuyere.

Plane segmental baffles or rings spaced longitudinally of the tuyere extend around the space between the shells and abut the entrance-passage walls alternately thus forming a continuous back-and-forth circulating passage circumferentially of the tuyere. A water inlet communicates with said entrance passage and an outlet with said circulating passage.

BRIEF DESCRIPTION OF THE DRAWINGS A complete understanding of the invention may be obtained from the following detailed description and explanation which refer to the accompanying drawings illustrating the present preferred embodiment. In the drawings:

FIG. 1 is an end view of our improved tuyere;

FIG. 2 is a section taken along the plane of line lI-II of FIG. 1, with parts in elevation;

FIG. 3 is a view similar to FIG. 2 showing the form we consider most desirable for a slag-notch cooler; and

FIG. 4 is a partial plan view, partly broken away to reveal the interior more clearly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now in detail to the drawings and, for the present, particularly to FIGS. 1 and 2, our tuyere is made up of inner and outer frusto-conical shells and l 1, an end ring 12 and a nose wall 13. A reinforcing ring 14 may be fitted around the larger end of shell 11 and end ring 12. Gussets 15 are spaced around the exterior of shell 10 at its larger end.

Spaced parallel walls 16 and 17 extend longitudinally between shells 10 and 11, forming an entrance passage 18 for water. Wall 17 terminates short of nose wall 13 as shown at 19. An inlet 20 through ring 12 communicates with passage 18.

A plurality of plane segmental baffles 21 spaced longitudinally of the tuyere abut walls 16 and 17 alternately with one end, the other end of each baffle being spaced from the other of said walls. This construction results in the formation of a continuous water-circulating passage 22 extending back and forth around the tuyere, as will appear more clearly in FIG. 4 illustrating the principle of the invention applied to a slagnotch cooler. An outlet 23 through ring 12 communicates with the far end of the last pass of passage 22. Baffles 21 are spaced more closely together adjacent the tuyere nose than at points remote therefrom to effect circulation at higher velocity nearer the nose than in the space remote therefrom.

It will be evident that termination of wall 17 short of nose wall 13 as shown at 18 affords communication between passage 18 and the first pass of passage 22 around the nose of the tuyere formed by wall 13. Walls 17 and 18 subtend an angle of about 30 at the common axis of shells l0 and 11 and the gap or angle between the ends of segmental bafiles 21 should be about 60 to atford easy communication between one l%ass and the next of circulating passage 22.

F S. 3 and 4 show the invention applied to a slag-notch cooler generally similar to the tuyere of FIGS. 1 and 2. Except for minor details, which are quite apparent, the construction is substantially the same in both cases. It is therefore unnecessary to repeat a detailed description of the slag-notch cooler.

Our invention, whether embodied in a tuyere or a slagnotch cooler, achieves more efficient water circulation and therefore better cooling than known structures, as well as higher water velocity and the elimination of dead spots.

We claim:

I. A blast-fumace appliance comprising spaced inner and outer shells, in the form of co-axial conical frusta, and end walls, a pair of spaced walls extending longitudinally between said frusta fomting an inlet passage and a plurality of plane segmental bafiles spaced axially along the appliance, extending around between the shells and abutting with one end alternately on said walls, the other ends of the baffles being spaced alternately from the other wall, and together forming a continuous circulating passage extending back and forth around the appliance, an inlet connection communicating with said inlet passage and an outlet connection communicating with said circulating passage.

2. The combination defined by claim I defined by said segmental batfles being spaced more closely at one end of the appliance than at the other. 

